# What is the most energy-efficient short throw projector? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the most energy-efficient short throw projector?

## Products

### BenQ LK936ST
```yaml
product: benq-lk936st
brand: BenQ
price_gbp: 3618.55
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 5100 ANSI lumens
resolution: 4K UHD (3840 x 2160)
input_ports: 2 x HDMI 2.0b, 1 x DisplayPort 1.2a, 1 x LAN (RJ45), 1 x HDBaseT (RJ45), 1 x 3D Sync In, 1 x 3D Sync Out, 1 x USB Type-A, 1 x RS232, 1 x wired remote in, 1 x wired remote out, 1 x 12V trigger
throw_ratio: 0.81 ~ 0.89
contrast_ratio: 3,000,000:1
keystone_correction: 3D vertical ±40 degrees, horizontal ±40 degrees, rotation ±40 degrees
```

- **Price:** £3618.55 [^1]
- **Summary:** The BenQ LK936ST is a bright 4K UHD short-throw laser projector with a 20,000-hour light source, 92% Rec.709 coverage, and dedicated Golf Mode. It suits golf simulators, home theaters, gaming, and large-screen installations where ambient light and flexible positioning are important.
- **Ideal For:** It suits energy-conscious short-throw use because its sealed laser light source lasts up to 20,000 hours with no lamp replacements, while the 0.81 ~ 0.89 throw ratio and 5100 ANSI lumens support large bright images from short distances.
- **Additional Sources:** [^2]

### Epson Lifestudio Grand
```yaml
product: epson-lifestudio-grand
brand: Epson
price_gbp: 1624.98
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 3600 lumens
resolution: 3840 x 2160
input_ports: 3 x HDMI, 2 x USB-A, 1 x USB-B, 1 x SPDIF, 1 x 3.5mm headphone jack
contrast_ratio: 5000000:1
```

- **Price:** £1624.98 [^3]
- **Summary:** The Epson Lifestudio Grand is an ultra-short-throw 4K PRO-UHD laser projector with 3600 lumens, built-in Google TV, and Sound by Bose. It suits home cinema, streaming, gaming, and bright living rooms where a large image is needed without ceiling mounting.
- **Ideal For:** It suits the most energy-efficient short throw projector question because its laser light source lasts up to 20000 hours and uses 193 W typically, while its ultra-short-throw design projects up to a 120 in image from close to the wall.
- **Additional Sources:** [^4], [^5]

### Epson Lifestudio Grand Plus
```yaml
product: epson-lifestudio-grand-plus
brand: Epson
price_gbp: 2215.88
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 4000 lumens color brightness, 4000 lumens white brightness
resolution: 4K (2160p), 8.29 million pixels
input_ports: 3 HDMI
throw_ratio: 0.16 - 0.40
contrast_ratio: 5000000:1
```

- **Price:** £2215.88 [^6]
- **Summary:** The Epson Lifestudio Grand Plus is an ultra-short-throw laser projector with 4K HDR projection up to 150in, 4000 lumens of color and white brightness, built-in Google TV, and Sound by Bose audio. It suits home theaters, living rooms, gaming setups, and other large-room entertainment spaces where a bright, immersive image is needed from a short distance.
- **Ideal For:** It suits the question because its ultra-short-throw laser design projects a large image from just inches away and its 350-watt power consumption with a 20000-hour eco-mode light life supports efficient long-term use.
- **Additional Sources:** [^7]

### BenQ TK700STi
```yaml
product: benq-tk700sti
brand: BenQ
price_gbp: 1254.93
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 3000 ANSI lumens
resolution: 4K UHD 3840 x 2160
input_ports: 2 x HDMI 2.0b, 1 x USB Type-A, 1 x RS232
throw_ratio: 0.91.08
contrast_ratio: 10000:1
keystone_correction: 2D, auto vertical ±30 degrees, horizontal ±30 degrees
```

- **Price:** £1254.93 [^8]
- **Summary:** The BenQ TK700STi is a 4K UHD short-throw projector with 3000 ANSI lumens, HDR10 support, Android TV, and low input lag for gaming. Its short-throw lens suits small to medium rooms, while built-in vertical and horizontal keystone correction makes setup more flexible.
- **Ideal For:** It suits energy-efficient short-throw use because its 0.91.08 throw ratio produces large images from a short distance, while SmartEco and Eco lamp modes can reduce power use and extend lamp life.

### BenQ LW890UST
```yaml
product: benq-lw890ust
brand: BenQ
price_gbp: 1513.45
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 4000 ANSI lumens
resolution: WXGA (1280x800)
input_ports: PC in (D-sub 15-pin), composite video in (RCA), S-Video in (Mini DIN 4-pin), 2x HDMI, LAN (RJ45), USB Type-A, 2x USB Type Mini-B, RS232 in (DB-9-pin), audio in (3.5mm mini jack)
throw_ratio: 0.24:1
contrast_ratio: 3,000,000:1
keystone_correction: 2D, vertical ±20 degrees; horizontal ±20 degrees
```

- **Price:** £1513.45 [^9]
- **Summary:** The BenQ LW890UST is a 4000-lumen WXGA laser projector with an ultra-short 0.24:1 throw ratio, allowing large images from a position close to the wall. Its sealed laser design, long 20,000-hour light-source life, extensive connectivity, and flexible keystone adjustment suit classrooms, meeting rooms, and other professional spaces.
- **Ideal For:** It suits energy-efficient short-throw use through its laser light source, 20,000-hour operating life, instant power-on, and 358W typical power consumption, while its 0.24:1 throw ratio supports close-wall installation.

### Optoma HZ146X-W Full HD DLP Laser Projector
```yaml
product: optoma-hz146x-w-full-hd-dlp-laser-projector
brand: Optoma
price_gbp: 553.23
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
lumens: 3800 ANSI lumens
resolution: Full HD 1080p (1920 x 1080)
input_ports: 2 x HDMI 2.0, 1 x USB-A power 1.5A, 1 x RS232
throw_ratio: 1.48:1 - 1.62:1
contrast_ratio: 2,000,000:1
keystone_correction: +/-30° horizontal and vertical
```

- **Price:** £553.23 [^10]
- **Summary:** The Optoma HZ146X-W is a bright Full HD laser projector with 3,800 ANSI lumens, a 30,000-hour laser light source, and support for screens up to 300 in. It suits home cinema, gaming, business, and education users who want vivid images, low maintenance, and flexible installation.
- **Ideal For:** It suits energy-efficient short throw projector searches because its laser light source uses 88 W in typical operation, lasts up to 30,000 hours, and provides 3,800 ANSI lumens with adjustable keystone correction, although its 1.48:1 - 1.62:1 throw ratio is standard throw rather than short throw.
- **Additional Sources:** [^11], [^12]

---
## References & Sources
[^1]: B&H Photo Video, accessed 2026-09-13. https://www.bhphotovideo.com/c/product/1669755-REG/benq_lk936st_5100_lumen_4k_uhd.html
[^2]: ProjectorScreen.com, accessed 2026-09-13. https://www.projectorscreen.com/products/benq-lk936st-4k-short-throw-laser-projector-5100-lumens
[^3]: Epson UK, accessed 2026-09-13. https://www.epson.co.uk/en_GB/products/projector/home-cinema/epson-lifestudio-grand-eh-ls670w%2C-ultra-short-throw-smart-laser-projector-tv%2C-4k-pro-uhd%2C-3%2C600-lumens%2C-sound-by-bose%2C-google-tv%2C-120%27%27-display%2C-5-year-warranty/p/54376
[^4]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/epson-lifestudio-grand-4k-pro-uhd-ust-laser-projector-3600-lumens-of-color-white-brightness-sound-by-bose-technology-black/JJG9Q2PQTF
[^5]: AV-Connection, accessed 2026-09-13. https://www.av-connection.com/?PGr=20569
[^6]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/epson-lifestudio-grand-plus-4k-ust-laser-projector-4000-lumens-of-color-and-brightness-sound-by-bose-3lcd-hdr-white/JJG9Q2PWT5
[^7]: Staples, accessed 2026-09-13. https://www.staples.com/epson-lifestudio-grand-plus-ultra-short-throw-laser-projector-white-v11hb83020/product_IM1740K69
[^8]: ProjectorScreen.com, accessed 2026-09-13. https://www.projectorscreen.com/BenQ-TK700STi-4K-HDR-Short-Throw-Gaming-Projector.html
[^9]: ProjectorCentral, accessed 2026-09-13. https://www.projectorcentral.com/benq-lw890ust.htm
[^10]: AV.com, accessed 2026-09-13. https://www.av.com/TV-and-Projectors/Optoma-HZ146X-W-Full-HD-DLP-Laser-Projector-White/71O8
[^11]: SimSpace Golf, accessed 2026-09-13. https://simspacegolf.com/products/optoma-hz146x-w-projector
[^12]: Standesk, accessed 2026-09-13. https://www.standesk.eu/product-page/optoma-hz146x-w-standard-throw-projector-3800-ansi-lumens